+ printf("[sic] check: there are %d atoms\n",md.count);
+ printf("[sic] check: atoms x pos: %.15f %.15f\n",md.atom[0].r.x,md.atom[1].r.x);
+ printf("[sic] check: atoms x vel: %.15f %.15f\n",md.atom[0].v.x,md.atom[1].v.x);
+ printf("[sic] check: atoms mass: %.35f %.35f\n",md.atom[0].mass,md.atom[1].mass);